booting ProLiant DL160 Gen8 in uefi

Hello,

I recently got an a DL 160 gen8 and I'm trying to boot windows from a 3TB drive. the  windows Installer is refusing to install windows on gpt partitions. So I need to boot in uefi. 

I looked everywhere but I can't find any bios configuration options! I don't see where  the bios boot options are...

I even started to wonder if my server is even capable of UEFI but the server provider confirmed that my server supports uefi.

Could you please help me to figure this out?

Thanks in advance